max / goingson

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1	//! Startup checks the binary owes the database it opens.
2	//!
3	//! go-mcp is built from the same source as the desktop app and selects the
4	//! columns that source assumes, so it has to apply pending migrations itself.
5	//! Leaving that to the app made every window where the app had not been
6	//! launched since a migration landed a window where every MCP read failed with
7	//! a bare `no such column`, mid-session and with no clue attached.
8
9	use std::path::Path;
10
11	use goingson_db_sqlite::Db;
12
13	/// Apply pending migrations, or explain what to run by hand.
14	///
15	/// The error names the database and the command that closes the gap, because
16	/// the failure a caller sees otherwise is a missing column with no context.
17	pub fn migrate(db: &Db, db_path: &Path) -> Result<(), String> {
18	goingson_db_sqlite::run_migrations(db).map_err(\|e\| {
19	format!(
20	"could not migrate {path}: {e}\n\
21	go-mcp will not serve a database whose schema it does not match.\n\
22	Close GoingsOn, back the file up, and run:\n \
23	cargo run -p goingson-db-sqlite --example migrate -- {path}",
24	path = db_path.display()
25	)
26	})
27	}
28